I understand and appreciate that -- plus I always write personalized messages. It's a very worthy time investment!

That being said, many firms don't have enough information on their websites -- and even in their job application info page! -- about what do they do technically and what is their current need.

That makes it hard to make a proper addressing to them while doing a sales pitch of your abilities and profile. And I refuse to engage in vague guess-work, too.

Thank you, I realize some people might not have responded because I didn't have enough info to go on to try and tell them why would I like working with them.